I have just looked at the latest PL table and points wise Tottenham in 4th are closer to relegation than the team in pole position.
Kasper doesn't move, it's a simple save. Looks like he'd guessed Benteke would go far corner, so (wrongly) took a huge step in that direction. Almost left Benteke with an empty net.
Although he appears to have slightly let himself down by not giving that Palace penalty. Still, of the three, it's probably the least important one to get right in terms of impact on the final result.